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1.#include iostream.hclass Date{int year;int month;int day;public:Date(int y, int m, int d){year = y;month = m;day = d;}void Display(){cout year / month / day endl;}intIsLearYear(){return year%4==0year%100!=0 || year%400==0;}voidsetDay(int d){day = d;}};2.2.ostream operator(ostream out, const Vector v){for(inti=0; iv.size; i++){out v.data[i] ;}return out;}Vector::Vector(int v[], int n){size = n;data = new int[n];for(inti=0; in; i++){data[i] = v[i];}}Vector::~Vector(){delete [] data;}Vector::Vector(const Vector v){size = v.size;data = new int[v.size];for(inti=0; isize; i++){data[i] = v.data[i];}}Vector Vector::operator=(const Vector v){if(this != v){delete [] data;size = v.size;data = new int[v.size];for(inti=0; isize; i++){data[i] = v.data[i];}}return *this;}int Vector::operator[](int index){return data[index];}1．编写一个函数模板，用于求数组中各元素之和，并编写测试程序进行测试。函数模板声明如下：template class TypeType Sum(Type tArray[], intiSize)2．定义一个抽象类CShape，它有一个纯虚函数GetLength()；派生出四边型类CSquare和圆类CCircle，在派生类中重载函数GetLength()，用于求图形的周长，编写测试程序进行测试。1．参考程序：#include iostreamusing namespace std;template class TypeType Sum(Type tArray[], intiSize){Type tSum = 0;for (inti = 0; i iSize; i++){tSum = tSum + tArray[i];}returntSum;}int main(void){int a[] = {1, 2, 3};double b[] = {1.5, 2.8, 8.9, 8};cout Sum(a, 3) endl;cout Sum(b, 4) endl;return 0;}2．参考程序：#include iostreamusing namespace std;classCShape{public:virtual double GetLength() const = 0;};classCSquare:publicCShape{public:CSquare(double dWidth, double dHeight){m_dWidth = dWidth;m_dHeight = dHeight;}doubleGetLength() const{return 2 * (m_dWidth + m_dHeight);}private:doublem_dWidth, m_dHeight;};classCCircle:publicCShape{public:CCircle(double dRadius){m_dRadius = dRadius;}doubleGetLength() const{return 3.1415926 * m_dRadius * m_dRadius;}private:doublem_dRadius;};int main(void){CSquareoSquare(2, 3);cout oSquare.GetLength() endl;CCircleoCircle(10);cout oCircle.GetLength() endl;return 0;}编写程序，定义抽象基类Shape(形状)，由它派生出3个派生类: Circle(圆形)、Rectangle(矩形)和Square